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In my script i check a small area (say 20x20 pixels) with looped PixelGetColor. This has worked without any real problems for months and has taken about 20ms to complete. To test my script, I'm running Photoshop and activate different layers to show different photos. This has also worked great. After a GPU replace (to the better) a week ago it worked great the first few days, but now I've come to a dead end. This is the deal: I open my .psd file and runs my script - performance is ok I switch to layer 2 and runs my script - performance is ok I switch back to layer 1 and runs my script - performance is horrible, almost 50ms. At this point it doesn't matter what I do, every use of PixelGetColor() is slow. Now, if I close Photoshop completely, reopens my .psd file and run the script again - performance is ok What could possible be the problem!? Could it be anything with the new Nvidia drivers - PhysX/hyperthreading and all that new shit (which I didnt use earlier)? After a search through the forums I've found some interesting stuff making me far from the only one having general performance issues using the PixelGetColor() function. I'm gonna take a shot using _GDIPlus_BitmapLockBits instead and see if that helps. But I wonder if there might be something more at work in my case? As mentioned, I'm using the same script as I have for months. I've tested with Photoshop again and again - same result. Also tried using Paint but then its horrible speed constantly. It's just now the problems started. Related links on the matter Setup WinXP GPU 1GB GeForce 3 GB RAM 1600x1200x32 Window Classic theme with all Performance Visual Effects turned off. AutoIt v22.214.171.124